Propeller attachment



y 1929- w. H. WENDT 1.719,860

v PROPELLER ATTACHMENT Filed May 7, 1927 I INVENTO/P WILL/AM H. WENDT y 624 GZJ Flrron/vzys li'atented July 9, 1929.

WILLIAM H. WENDT, OF LITTEL E FALLSS, MINNESOTA.

PROIELLER ATTACHMENT.

Application filed May 7, 1927. Serial No. 189,589.

This invention. relates to improvements in propeller attachments and more particularly to such a device lunctionin g to lessen the ellcctive propelling angle oil? the propeller blades 5 tor the purpose of reducin the speed ola boator vessel.

The attachment is particularly adaptable for use in connection with small propellers, such as are conmionly used on out board pro in pcllcr mountings, and, in. which devices, for motors are usually directly connected with the propeller, that is, no mechanism is provided for varying the speed of the propeller, as is customary on larger boats or vessels, and the purpose of this attachment is to lessen the el'iccl'ive propelling angle ol? the propeller blades to the extent that the speed of propulsion, of the vessel will be considerably re duced, when the attachment is attached. to the propeller and the latter rota-ting at a given speed,

Other objects of the invention reside in the simplicity and general construction of the attaclmient, which permits it to be readily attached to and detached from a propeller; the simple means for securely locking it to the propeller; and, in the design. of the device, as a whole, which is such that it may readily be applied to propellers of standard construction. with a minimum amount oit labor.

llhe particular object ot the inwntion there tore, is to provide an improved attachment for propellers.

Other objects of the invention will appear from the 'liollowing description and accompanying drawingr; and will be pointed out in the annexed claims.

.lin the aceoinpauying drawings there has been. disclosed a structure designed to carry out the various objects of the invention, but is to be umlerstood that the invention is not conl'ined to the exact features shown, as various changes may be made within the scope oil? the claims which tollow.

In the accompanying drawings forming pa rt of this specification;

Figure 1 is a side elevation of a propeller, showing the attachment applied thereto;

Figure 2 is a vertical sectional view on the line 2-42 of Figure 1;

Figure 3 is an end view of Figure 1;

l iigure l is a detailed sectional. View on the ll of Figure 2;

re t r a l Llll peller for the purpose Figure 6 is a View, showing the attachment ren'ioved .lrom the propeller.

In the selected embodiment of the inventionhere shown, for purposes of disclosure, there is illustrated a propeller oi. ordinary construction, comprising blades 2 mounted upon a, hub 3, suitably secured to the shaft 4, whicl'i operatively connected to a suitable source of power, not shown.

The novel attachment featured in this invention is shown in Figure (3, and comprises blade portions 5, pre'lln'ably integrally formed oili metal and having a central aperture 6 in the connecting portion 7, between the blades, which znlapted. to receive the end of the hub 23, as shown in Figure 3. The inner tlaces 8 of the blade portions 5 are shaped to coincide with the adjacent or outen'faees ol the nropeller blades when seated therea gai est, as shown in Figure &. In this figure, it will be noted, that the blade portions 8 are substantially V-shaped in cross section so that when the attachment is secured to "the propeller, the effective or outer angle oi? the propeller blades will be considerably lessened, thereby causing a reduction in the speed of propulsion of the vessel. The broken line (Z-(Z indicates the normal propelling angle of the blades, and the broken line b-7) ind icates the etlectivc propellii'ig angle of the blades, when the attachment attached thereto.

Dowel pins 9 are secured to the inner faces of the blade portions S of the attachi'nent and are adapted to be received in apert es 10, provided in the propeller blades 2, as shown in Figure 5 The dowel pins 9 are oil? sul'; licient length to project through the propeller blades 2 as shown. in Figure 4;. Each pin is further provided. with notches or recesses 11, adapted to be engaged. by locking clips 12, yieldably connected with the attachment by means of tension springs 13, shown in Figures l, 2, and 6. Each clip 12 has a key slot 14 therein adapted to receive a dowel pin.

In attaching this simple device to a proof reducing the ellective propelling force or power of the propeller, the attachment mounted. upon the propeller as shown. in Figures 1 3, and L, in which position. the dowel pins 9 will project through the propeller blades 2. The clips 12 and springs 13 are then brought around to the o aposlte sides of the prope .ler bl es nd th with. the

the propeller blades,

adapted to traverse the of the key slots 14 will engage the recesses 11 ment to the propeller in the manner shown in Figures 1, 2, and 4. When thus mounted, it

will be noted that the attachment in effect becomes an integral part ofthe propeller, and as a result of the V-shaped cross section of the blade portions 8, the effective propelling angle of the propeller will be reduced to the extent that when the propeller is rotated in the water at a given speed, the speed of the boat or vessel will be considerably reduced. hen it is desired to increase the speedgof the vessel, the attachment may be quickly removed from the propeller by simply. disengaging the clips 12 from the dowel pins 9, after which the attachment may be detached from the prdpeller and the speed of the boat will accordingly be increased.

I claim as my invention:

1. An attachment for a propeller comprising curved faces formed to be abuttingly engaged with the faces of the propeller blades and shaped to lessen the effective angle of and spring-actuated clips secured tortheattachment and adapted to be lockingly engaged With the propeller to secure the attachment thereto.

2. An attachment for a propeller comprising curved faces formed to be abuttingly engaged with the faces of the propeller blades and shaped tolessen the effective angleof the propeller blades, and spring-actuated clips secured to the attachment. and adapted partially tosurround the propeller blades to securely lock the attachment 3. The combination with a propeller havingv inclined blades and an aperture in each blade, of an attachment having curved, i11- clined faces, formed tobe seatedagainst the correspondingly curved faces of the propeller blades for the purpose of lessening the effective propelling angle of the propeller blades, dowel pins secured to. the attachment and to the propeller.

peller blades, and spring retained clips also secured to the attachment and adapted to partially encircle the propeller blades and to engage the protruding terminals of'the dowel pins to lock the attachment to the propeller.

apertures in the pro- 4. The combination with a propeller having inclined blades and an aperture in cach blade, of an attachment having curved, inclined faces, formed to be abuttingly seated against the corrcspomlingly curved faces of the propeller blades for the purpose of lessoning the effective propelling angle of the propcller blades, dowel pins secured to the attachment and adapted to traverse the apertures in the propeller blades, springs sccul'cd to the attachment, and a clip terminally secured to each spring and each having a key slot therein adapted to receive one of the protruding terminals of the dowcl pins to lock the attachmentto the propeller.

5. A boat propeller having rclatiwly lixcd blades, and means seated on the working surfaces of said blades on one side and secured thereto, and formed to change the ell'cctive angle of said blades whereby their propclling effect in the water will be varied.

(3. A boat propeller comprising iailativcly fixed blades, and a plate fitting the working surfaces of said blades 011 one side and varying in thickness transwrsely to lessen the effective angle of the propeller blades to vary their propelling effect.

7. A boat propeller comprising suitable blades and auxiliary blades adapted to lit the working surfaces of said propeller blades on one side, and means for temporarily securing them together, said auxiliary bladcs being tapered in cross-section whereby, when socured to the propeller blades, their angle to the water will be changed from that of said first mentioned blades and the propelling effect reduced for the purpose specilicd.

' 8. A boat propeller comprising a hub and blades radiating therefrom, auxiliary blades adapted to be mounted upon said hub and concentrically with respect to said propeller and fit snugly against the working faces of said propeller blades on one side, said auxiliary blades decreasing in cross-sect ional area and presenting a less degree angle than the first mentioned blades to the water to reduce the propelling effect of the propeller bladcs.

In witness whereof, I have hcreun to set my hand this 29th day of April, 192?.

VILLIAM H. YVENDI. 

